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Following Malheiro et al. (2012) we describe the so-called low magnetic fieldmagnetars, SGR 0418+5729, Swift J1822.3--1606, as well as the AXP prototype 1E2259+586 as massive fast rotating highly magnetized white dwarfs. We givebounds for the mass, radius, moment of inertia, and magnetic field for thesesources by requesting the stability of realistic general relativistic uniformlyrotating configurations. Based on these parameters, we improve the theoreticalprediction of the lower limit of the spindown rate of SGR 0418+5729; for awhite dwarf close to its maximum stable we obtain the very stringent intervalfor the spindown rate of 4.1E-16< dP/dt < 6E-15, where the upper value is theknown observational limit. A lower limit has been also set for SwiftJ1822.3-1606 for which a fully observationally accepted spin-down rate is stilllacking. The white dwarf model provides for this source dP/dt> 2.13E-15, if thestar is close to its maximum stable mass. We also present the theoreticalexpectation of the infrared, optical and ultraviolet emission of these objectsand show their consistency with the current available observational data. Wegive in addition the frequencies at which absorption features could be presentin the spectrum of these sources as the result of the scattering of photonswith the quantized electrons by the surface magnetic field.

SGR 0418+5729, Swift J1822.3-1606, and 1E 2259+586 as massive fast rotating highly magnetized white dwarfs